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Josephson flux-flow oscillator: The microscopic tunneling approach

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journal contribution
posted on 18.08.2017 by D Gulevich, V.P. Koshelets, Feodor Kusmartsev
We elaborate a theoretical description of large Josephson junctions which is based on Werthamer's microscopic tunneling theory. The model naturally incorporates coupling of electromagnetic radiation to the tunnel currents and, therefore, is particularly suitable for description of the self-coupling effect in Josephson junction. In our numerical calculations we treat the arising integro-differential equation, which describes temporal evolution of the superconducting phase difference coupled to the electromagnetic field, by the Odintsov-Semenov-Zorin algorithm. This allows us to avoid evaluation of the time integrals at each time step while taking into account all the memory effects. To validate the obtained microscopic model of large Josephson junction we focus our attention on the Josephson flux-flow oscillator. The proposed microscopic model of flux-flow oscillator does not involve the phenomenological damping parameter, rather the damping is taken into account naturally in the tunnel current amplitudes calculated at a given temperature. The theoretically calculated current-voltage characteristics is compared to our experimental results obtained for a set of fabricated flux-flow oscillators of different lengths.

History

School

  • Science

Department

  • Physics

Published in

Physical review B: Condensed matter and materials physics

Volume

B 96

Citation

GULEVICH, D.R., KOSHELETS, V.P. and KUSMARTSEV, F.V., 2017. Josephson flux-flow oscillator: The microscopic tunneling approach. Physical Review B, 96 (2), 024515-1 - 024515-12.

Publisher

© American Physical Society

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017-07-24

Notes

This paper was accepted for publication in the journal Physical Review B and is also available at http://dx.doi.org/10.1103/PhysRevB.96.024515.

ISSN

2469-9950

eISSN

2469-9969

Language

en

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